Ecuaciones
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Transcript of Ecuaciones
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Colegio Las RosasSección secundaria MatemáticasProyecto de método de igualación Tania Correa Julia Fernanda Rodríguez Sosa2º B
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Método de igualación
Se localizan las ecuaciones
2x+y=33x+2y=2
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1.- Despejar cualquiera de las incógnitas en ambas ecuaciones
3/22
2/3
223
32
yx
yx
yx
yx
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2.- Igualamos los valores de “x” que hemos obtenido
3/222/3 yy
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• 3.- Resolvemos la ecuación • 3-y/2 = 2-2y/3
3 (3-y)=2(2-2y) 9-3y= 4-4y -3y+4y=4-9 Y=-5
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• 4.- Sustituimos la ecuación
X= 3-y/2 X=3- y(-5)/2
3+5/2 X=8/2 X=4
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Comprobación • Se sustituyen los valores encontrados en las
ecuaciones originales 2x+y=3 3x+2y=2 3x+2y=2 3 (4) + 2 (-5)=2 2(4)-5=3 12-10=2 8-5=3
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Ejemplo
x-y =-12x-3y=5
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X= -1+y/1 X= 5+3y/2 -1+y/1=5+3y/2 2(-1+y)=1(5+3y) -2+ 2y= 5+3y 2y-3y= 5+2 1y= 7 y= -7
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• X-y=-1x=-1+(-7)X=-1-7=-8
X=-8
x-y =-1 2x-3y=5-8+7= -1 2(-8)+3(-7)=5
-16+ 21= 5